.page-about {
  --about-edge: clamp(16px, 4vw, 56px);
  background: var(--stand);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .page-shell {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: var(--page-pad);
}

.page-about .grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.page-about .grid-12 > * {
  grid-column: 1 / -1;
  min-width: 0;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 50px);
  line-height: 1.08;
  letter-spacing: -0.018em;
  font-weight: 900;
  margin: 10px 0 16px;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ice);
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(22px, 3.5vw, 40px) clamp(44px, 6vw, 88px);
  background:
    radial-gradient(circle at 78% 8%, rgba(198, 255, 74, 0.14), transparent 42%),
    linear-gradient(162deg, #14352a 0%, var(--stand) 58%, var(--ink-soft) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(242, 233, 218, 0.055) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(242, 233, 218, 0.045) 0 1px, transparent 1px 92px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(46vw, 560px);
  height: min(52vh, 460px);
  z-index: -1;
  pointer-events: none;
  background: rgba(198, 255, 74, 0.07);
  clip-path: polygon(34% 0, 100% 0, 100% 74%, 0 0);
}

.page-about .about-hero__grid {
  align-items: end;
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 8.4vw, 96px);
  line-height: 0.97;
  letter-spacing: -0.025em;
  font-weight: 900;
  margin: 14px 0 20px;
}

.page-about .about-hero__title span {
  color: var(--lime);
}

.page-about .about-hero__lede {
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(242, 233, 218, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  padding: clamp(18px, 2.6vw, 28px);
  box-shadow: 10px 10px 0 rgba(217, 206, 187, 0.09);
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 46px;
  height: 3px;
  background: var(--lime);
}

.page-about .about-hero__panel-title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .index-list__item {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .index-list__item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .index-list__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.page-about .index-list__label {
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-hero__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .media-frame {
  position: relative;
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}

.page-about .about-hero__media img {
  aspect-ratio: 14 / 8;
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  background: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-block: clamp(48px, 7vw, 96px);
}

.page-about .about-sec-head {
  max-width: 46em;
}

.page-about .about-sec-head__note {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 233, 218, 0.7);
  margin: 0;
}

.page-about .year-index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
}

.page-about .year-index__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-right: 4px;
}

.page-about .year-index__link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  padding: 5px 11px;
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .year-index__link:hover,
.page-about .year-index__link:focus-visible {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  outline: none;
}

.page-about .timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(198, 255, 74, 0.12) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(26px, 3.6vw, 40px) 30px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border: 2px solid var(--lime);
  border-radius: 50%;
  background: var(--ink-soft);
  box-shadow: 0 0 0 4px rgba(198, 255, 74, 0.08);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.32;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .timeline__body > p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 233, 218, 0.75);
  max-width: 42em;
}

.page-about .timeline__more {
  margin-top: 12px;
}

.page-about .timeline__more summary {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ice);
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(92, 225, 192, 0.35);
}

.page-about .timeline__more summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__more summary::before {
  content: "+";
  font-size: 13px;
  line-height: 1;
}

.page-about .timeline__more[open] summary::before {
  content: "–";
}

.page-about .timeline__more p {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 2px solid rgba(198, 255, 74, 0.4);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-arc {
  margin-top: clamp(34px, 5vw, 60px);
  align-items: center;
}

.page-about .about-arc__media img {
  aspect-ratio: 1 / 1;
  box-shadow: 12px 12px 0 rgba(217, 206, 187, 0.08);
}

.page-about .about-arc__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.28;
  font-weight: 900;
  margin: 10px 0 12px;
}

.page-about .about-arc__text {
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 233, 218, 0.74);
}

.page-about .about-arc__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-arc__facts li {
  background: var(--ink-soft);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-arc__facts .numeric {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2vw, 23px);
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-arc__facts li span:last-child {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  position: relative;
  background: var(--panel);
  padding-block: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-team__grid {
  align-items: start;
}

.page-about .about-team__lede {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 233, 218, 0.76);
  margin: 0 0 26px;
  max-width: 34em;
}

.page-about .role-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-strong);
}

.page-about .role-card {
  background: var(--stand);
  padding: clamp(16px, 2.4vw, 24px);
  position: relative;
  transition: background 0.25s ease;
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  background: var(--ink-soft);
}

.page-about .role-card__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
  margin: 0 0 8px;
}

.page-about .role-card__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
}

.page-about .role-card__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(242, 233, 218, 0.7);
}

.page-about .about-team__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--amber);
  background: rgba(255, 179, 71, 0.07);
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(242, 233, 218, 0.78);
}

.page-about .about-team__media img {
  aspect-ratio: 10 / 7;
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(46px, 7vw, 92px);
  border-top: 3px solid var(--lime);
}

.page-about .about-scope .eyebrow {
  color: rgba(7, 13, 11, 0.5);
}

.page-about .about-scope__head {
  max-width: 48em;
}

.page-about .about-scope__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(7, 13, 11, 0.72);
}

.page-about .scope-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(7, 13, 11, 0.18);
  border: 1px solid rgba(7, 13, 11, 0.18);
  margin-top: clamp(24px, 3.5vw, 38px);
}

.page-about .scope-cell {
  background: var(--paper);
  padding: clamp(16px, 2.4vw, 26px);
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .scope-cell:hover {
  background: #F7F0E4;
  border-bottom-color: var(--amber);
}

.page-about .scope-cell__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.8vw, 42px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--stand);
  margin: 0 0 8px;
}

.page-about .scope-cell__label {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(7, 13, 11, 0.62);
}

.page-about .about-scope__notes {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid rgba(7, 13, 11, 0.16);
  padding-top: clamp(22px, 3vw, 32px);
}

.page-about .about-scope__note h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-scope__note p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(7, 13, 11, 0.68);
}

/* ---------- 协作与内容 ---------- */
.page-about .about-collab {
  background: var(--stand);
  padding-block: clamp(46px, 7vw, 92px);
  border-top: 1px solid var(--line);
}

.page-about .about-collab__grid {
  align-items: start;
}

.page-about .about-collab__lede {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 233, 218, 0.72);
  margin: 0;
  max-width: 26em;
}

.page-about .about-collab__list {
  display: grid;
  gap: 0;
}

.page-about .collab-item {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--line);
}

.page-about .collab-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .collab-item__tag {
  display: inline-block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
}

.page-about .collab-item__title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.32;
  font-weight: 900;
  margin: 0 0 8px;
}

.page-about .collab-item p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(242, 233, 218, 0.72);
  max-width: 40em;
}

.page-about .collab-item__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 74, 0.4);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .collab-item__link:hover,
.page-about .collab-item__link:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
  outline: none;
}

/* ---------- 联系 ---------- */
.page-about .about-service {
  background: var(--ink);
  padding-block: clamp(46px, 7vw, 92px);
  border-top: 1px solid var(--line);
}

.page-about .about-service__lede {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 233, 218, 0.75);
  margin: 0;
  max-width: 32em;
}

.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-service__panel {
  background: var(--panel);
  border: 1px solid var(--line-strong);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .contact-list__item {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .contact-list__item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .contact-list__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .contact-list__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .contact-list__value.numeric {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .about-service__note {
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--muted);
  border-top: 1px dashed var(--line-strong);
  padding-top: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-scope__notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .scope-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-arc__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .grid-12 > .span-4 { grid-column: span 4; }
  .page-about .grid-12 > .span-5 { grid-column: span 5; }
  .page-about .grid-12 > .span-6 { grid-column: span 6; }
  .page-about .grid-12 > .span-7 { grid-column: span 7; }
  .page-about .grid-12 > .span-8 { grid-column: span 8; }

  .page-about .about-hero__grid {
    row-gap: 0;
  }

  .page-about .about-hero__panel {
    margin-bottom: 6px;
  }

  .page-about .timeline {
    padding-left: 220px;
  }

  .page-about .timeline::before {
    left: 152px;
  }

  .page-about .timeline__item {
    padding-left: 0;
  }

  .page-about .timeline__item::before {
    left: -74px;
    top: 9px;
  }

  .page-about .timeline__year {
    position: absolute;
    left: -220px;
    top: 4px;
    width: 140px;
    text-align: right;
    margin-bottom: 0;
  }

  .page-about .about-collab__list {
    border-left: 1px solid var(--line);
    padding-left: clamp(20px, 3vw, 36px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-index__link,
  .page-about .role-card,
  .page-about .scope-cell,
  .page-about .collab-item__link {
    transition: none;
  }
}